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Running a ducky is a common slang term to mean "running late." It is only ever correctly used in gerund form.
"We've been waiting for 15 minutes! Boy, he's running a ducky."

NOT: "The other day I ran a ducky. The guys were so pissed."
by Missing Goat April 18, 2009

Words related to Running a ducky

behind delayed in a hurry late procrastinating running late tardy